Pump jack gearing



March22,194& W, ROCHELTREE 2,465,033

PUMP JACK GEARINGL 4 Filed Dec. 4, 1945 WE flemzifiaa 1 N VEN TOR.

Patented Mar. 22, 1949 UNITED STATES PATENT OFFICE PUMP JACK GEARING Warren R. Ocheltree, Wapato, Wash.

Application December 4, 1945, Serial No. 632,763

1 Claim. 1

This invention relates to gearing, and more particularly to gearing used in pump jack construction.

The primary object of the invention is to provide gearing for operating the pitman of a pump operating mechanism, which pitman provides a connection between the main gear of the pump jack and the pump piston, which will rapidly return the piston to the limit of its downward movement, preparatory to making its neXt suction stroke, thereb appreciably speeding up the operation of the pump with the result that the pumping capacity of the pump and jack will be greatly increased.

With the foregoing and other objects in view which will appear as the description proceeds, the invention consists of certain novel details of construction and combinations of parts hereinafter more fully described and pointed out in the claims, it being understood that changes may be made in the construction and arrangement of parts without departing from the spirit of the invention as claimed.

Referring to the drawing:

Figure 1 is an elevational view illustrating gearing constructed in accordance with the invention as forming part of a pump jack.

Figure 2 is a perspective view taken on line 2-2 of Figure 1.

Figure 3 is a rear elevational view of the gearing, illustrating the segmental gear, forming an important feature of the invention, as moved to operate the piston, on its suction stroke.

Referring to the drawing in detail the frame of a pump jack is indicated by the reference character 5 and as shown, the frame is provided with bearings for the shafts 6 and 1.

The shaft 6 represents the drive shaft of the pump jack, and is operated by the desired mechanical means, such as a windmill structure, motor or the like.

Secured to the shaft 6 is the drive gear 8 which is secured to the substantially oval eccentrically mounted gear member 9 that is formed with a pair of teeth It] and a curved surface I I.

Mounted on the shaft I, is the segmental gear I2 which is adapted to mesh with the teeth of the drive gear 8, to receive motion therefrom. As shown, the gear 8 is small while the segmental gear I2 is substantially large providing the necessary gear ratio to cause the steady operation of the pitman [3 connected to the segmental gear I2, as shown by Figure 3 of the drawing.

Secured to the rear surface of the gear I2, is an arm I4 which is also mounted on the shaft 1, the arm I4 being formed with the teeth I5 that mesh with the teeth I during rotation of the segmental gear I 2. The arm I4 is formed with a curved edge I6 which is adapted to engage the curved edge or surface II of the oval gear memher 9 during each complete rotation of the gear The contact of the arm I 4 with one edge of the gear 9, takes place after the piston has completed its suction stroke, and the pitman has completed its working stroke. The contact of the arm I4 with the gear 9, causes the gear 9 to be moved to a position wherein the teeth [0 thereof contact with the teeth I of the arm I4.

From the foregoing it would be seen that as the gear I2 moves in the direction of the arrow and the pitman is in th position as shown in Figure 3 of the drawing, the pitman I3 is moving to its idle stroke.

When the teeth of gears 8 and I2 are disengaged, the teeth In have moved to a position to engage the teeth I5, whereupon the further rotation of the gear I2 will cause the pitman I3 to move rapidly to its lowermost position.

As the rotation of the gear I2 continues, it will be seen that while the gear I2 moves gradually, the pitman is making its power stroke, and that when the pitman l3 reaches its uppermost position, the gears II] and I5 will mesh, and further rotation thereof will cause the pitman I3 to be moved rapidly downwardly during the idle stroke of the pitman, eliminating the necessity of the main gear I2 being moved gradually during the idle stroke of the pitman, as would be the case if a complete circular gear were used in place of the gear I2.

In the operation of the device, the pumping time for pumping a given quantity of water or other fluid, will be greatly reduced, with the result that wear on the gearing will be correspondingly reduced.

What is claimed is:

A pump jack construction comprising a drive shaft and a driven shaft, a drive gear secured on the drive shaft, an eccentrically mounted gear member to which the drive gear is secured, said eccentrically mounted gear having an elongated curved surface and a pair of teeth at one end thereof, a segmental driven gear secured on the driven shaft, a pitman connected with the segmental gear, said segmental gear adapted to mesh intermittently with the drive gear, whereby the 3 driven gear rotates at a, low rate of speed during REFERENCES CITED the power stroke of the pitman, an arm secured to the segmental gear, said arm having an eni g ,gg are of record in the larged end formed with teeth adapted to mesh with the pinion of the teeth on the segmentally 5 UNITED STATES PATENTS mounted gear member during rotation thereof, Number Name Date rotating the segmental gear through the arm. 463,980 Allen No 24 1891 488,373 Touch Dec. 20, 1892 WARREN OCHELTREE' 1,209,337 Harris Dec. 26, 1916 

